private String getAnswerMessage(PropertyChangeEvent e, Answer answer, ExoSocialActivity comment) {
   String answerContent = ActivityUtils.processContent(answer.getResponses());
   if ("answerEdit".equals(e.getPropertyName())) {
     I18NActivityUtils.addResourceKey(comment, "answer-update-content", answerContent);
     return "Answer has been edited to: " + answerContent;
   } else if ("answerPromoted".equals(e.getPropertyName())) {
     I18NActivityUtils.addResourceKey(comment, "answer-promoted", answerContent);
     return "Comment " + answerContent + " has been promoted as an answer";
   } else if ("answerActivated".equals(e.getPropertyName())) {
     if (answer.getActivateAnswers()) {
       I18NActivityUtils.addResourceKey(comment, "answer-activated", answerContent);
       return "Answer has been activated: " + answerContent + ".";
     } else {
       I18NActivityUtils.addResourceKey(comment, "answer-unactivated", answerContent);
       return "Answer has been unactivated: " + answerContent + ".";
     }
   } else {
     if (answer.getApprovedAnswers()) {
       I18NActivityUtils.addResourceKey(comment, "answer-approved", answerContent);
       return "Answer has been approved: " + answerContent + ".";
     } else {
       I18NActivityUtils.addResourceKey(comment, "answer-disapproved", answerContent);
       return "Answer has been disapproved: " + answerContent + ".";
     }
   }
 }
  @Override
  public void saveAnswer(String questionId, Answer answer, boolean isNew) {
    try {
      ExoContainer exoContainer = ExoContainerContext.getCurrentContainer();
      IdentityManager identityM =
          (IdentityManager) exoContainer.getComponentInstanceOfType(IdentityManager.class);
      ActivityManager activityM =
          (ActivityManager) exoContainer.getComponentInstanceOfType(ActivityManager.class);
      FAQService faqS = (FAQService) exoContainer.getComponentInstanceOfType(FAQService.class);
      Question question = faqS.getQuestionById(questionId);
      Identity userIdentity =
          identityM.getOrCreateIdentity(
              OrganizationIdentityProvider.NAME, answer.getResponseBy(), false);
      String activityId = faqS.getActivityIdForQuestion(questionId);

      //
      String answerContent = ActivityUtils.processContent(answer.getResponses());

      if (activityId != null && answer.getApprovedAnswers()) {
        try {
          ExoSocialActivity activity = activityM.getActivity(activityId);
          ExoSocialActivity comment = createCommentForAnswer(userIdentity, answer);

          if (!comment.getTitle().equals("")) { // Case update answer or promote comment to answer
            String promotedAnswer = "Comment " + answerContent + " has been promoted as an answer";
            if (promotedAnswer.equals(comment.getTitle())) {
              // promote a comment to an answer
              updateCommentTemplateParms(comment, answer.getId());
              activityM.saveComment(activity, comment);
              faqS.saveActivityIdForAnswer(questionId, answer, comment.getId());

              // update question activity content
              updateActivity(activity, question);
              activityM.updateActivity(activity);
            } else {
              // update answer
              activityM.saveComment(activity, comment);
              String answerActivityId = faqS.getActivityIdForAnswer(questionId, answer);
              faqS.saveActivityIdForAnswer(
                  questionId, answer, answerActivityId + "," + comment.getId());
            }
          } else {
            // Case submit new answer
            comment.setTitle("Answer has been submitted: " + answerContent);
            I18NActivityUtils.addResourceKey(comment, "answer-add", answerContent);

            updateActivity(activity, question);
            activityM.updateActivity(activity);

            updateCommentTemplateParms(comment, answer.getId());
            activityM.saveComment(activity, comment);

            faqS.saveActivityIdForAnswer(questionId, answer, comment.getId());
          }

        } catch (Exception e) {
          LOG.debug("Run in case of activity deleted and reupdate");
          activityId = null;
        }
      }
      if (activityId == null) {
        saveQuestion(question, false);
        String newActivityId = faqS.getActivityIdForQuestion(question.getId());
        ExoSocialActivity activity = activityM.getActivity(newActivityId);
        ExoSocialActivity comment = createCommentForAnswer(userIdentity, answer);
        if (comment.getTitle().equals("")) {
          comment.setTitle("Answer has been submitted: " + answerContent);
          I18NActivityUtils.addResourceKey(comment, "answer-add", answerContent);
          updateCommentTemplateParms(comment, answer.getId());
        }
        activityM.saveComment(activity, comment);
      }
    } catch (Exception e) { // FQAService
      LOG.error("Can not record Activity for space when post answer ", e);
    }
  }